Photograph of David M. Schnorrenberg

David M. Schnorrenberg


David M. Schnorrenberg is a partner in the firm's Antitrust & Competition and Litigation groups and serves as the firm's General Counsel. His practice focuses on complex commercial litigation, particularly antitrust and intellectual property disputes, although he has considerable experience litigating in a variety of other substantive areas of the law, including securities, contracts, consumer protection, product liability, insurance coverage, civil rights and the First Amendment.

David has litigated in numerous venues throughout the United States, including federal and state courts, trial and appellate courts, arbitration panels, and administrative agencies. David has extensive experience in complex, multi-forum litigation, including large multi-district litigation (MDL) and class actions, as well as governmental enforcement proceedings. Among other things, he has:

  • Defended a German printing press manufacturer from claims of patent infringement, while prosecuting its antitrust counterclaims based on fraud on the Patent Office and sham litigation.
  • Defended a German automobile manufacturer against claims of patent infringement in proceedings before the U.S. International Trade Commission (ITC) under Section 337 of the Tariff Act of 1930, while simultaneously defending a parallel patent infringement action in federal court.
  • Prosecuted an MDL price fixing case on behalf of over 100 mining companies.
  • Defended a pharmaceutical manufacturer against antitrust claims in a federal MDL class action and related state court class actions.
  • Defended a major U.S. airline at trial in an antitrust divestiture action brought by the United States Department of Justice under Section 7 of the Clayton Act.
  • Prosecuted on behalf of a major telecommunications manufacturer copyright and trade secret cases relating to its proprietary software.
  • Defeated class certification in a consumer protection action against a major telecommunications service provider in Maryland state court.
  • Defended the Commission on Presidential Debates against alleged civil rights violations asserted by U.S. Presidential candidate Ralph Nader.
  • Defended the Bishop of the Episcopal Diocese of Washington in a case involving First Amendment rights under the U.S. Constitution.

David was a Harlan Fisk Stone Scholar at Columbia University School of Law and an Articles Editor for the Columbia Human Rights Law Review. David is also a former editor of The Antitrust Litigator, a newsletter of the ABA Committee on Antitrust Litigation. He was a John Motley Morehead Scholar at the University of North Carolina, was elected to Phi Beta Kappa and graduated with honors. David is a member of the bars of the District of Columbia and the State of New York, as well as various federal district and appellate courts.


  • University of North Carolina, B.A. (1986)
  • Columbia Law School, J.D. (1989)


Admitted to practice: District of Columbia, New York

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Crowell & Moring's Antitrust Group Listed as "Highly Recommended" in Global Competition Review's 19th Annual "GCR 100" (February 22, 2019)
Firm News / Announcement
Crowell & Moring's Antitrust Group Featured in Global Competition Review's 15th Edition "GCR 100" (January 22, 2015)
Firm News / Announcement
Washington Litigation Departments of the Year: Crowell & Moring General Civil Litigation National Law Journal (June 24, 2013)
Press Coverage
Crowell & Moring Recognized by National Law Journal as Washington, D.C. "General Civil Litigation" Department of the Year (June 24, 2013)
Firm News / Announcement
"District of Columbia," Business Torts: A Fifty-State Guide, Wolters Kluwer Law & Business (2013 ed.). Co-Authors: John L. Cuddihy, David M. Schnorrenberg, and Andrew H. Marks.
"Multi-District Litigation in Intellectual Property Disputes: Getting In, Getting Out, and Dealing With the MDL Panel," IP Litigator (March/April 2010). Co-Authors: David M.Schnorrenberg and John L. Cuddihy.
"The DOJ And FTC Issue Their Second Report On The Interface Of IP And Antitrust Law," Antitrust Law Alert (April 18, 2007). Contacts: David M. Schnorrenberg, Mark Supko
Client Alert / Newsletter
"Will German Products Which Infringe U.S. Patents Be Barred From Continued Sales In The U.S.?," VPP-Rundbrief Nr. 1 (January 2007). Co-Authors: Jeffrey H. Howard, Werner Berg and David Schnorrenberg.
"Most Action in 50 Years," Global Competition Review (June 2006). Co-Authors: Jeffrey H. Howard, David M. Schnorrenberg and Jeffrey Blumenfeld.
"District of Columbia," Business Torts: A Fifty-State Guide, Aspen (2006). Co-Authors: David M. Schnorrenberg, Andrew H. Marks, and David K. Osei.

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Crowell & Moring LLP is an international law firm with offices in the United States, Europe, MENA, and Asia that represents clients in litigation and arbitration, regulatory and policy, and transactional and corporate matters. The firm is internationally recognized for its representation of Fortune 500 companies in high-stakes litigation and government-facing matters, as well as its ongoing commitment to pro bono service and diversity, equity, and inclusion.

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